Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/16—Catalysts
  • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
  • C08G18/20—Heterocyclic amines; Salts thereof
  • C08G18/2045—Heterocyclic amines; Salts thereof containing condensed heterocyclic rings
  • C08G18/2063—Heterocyclic amines; Salts thereof containing condensed heterocyclic rings having two nitrogen atoms in the condensed ring system
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2120/00—Compositions for reaction injection moulding processes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2130/00—Compositions of compatibilising agents used in mixtures of high-molecular-weight compounds having active hydrogen with other compounds having active hydrogen

Definitions

• This invention relates to polyol blends and their use in the production of polymeric articles by the reaction injection moulding process and/or by various foaming techniques from reaction mixtures containing organic polyisocyanates and isocyanate-reactive components.
• moulded articles for example automotive body parts or flexible foam moldings
• organic polyisocyanates and isocyanate-reactive components are well established.
• two reactive liquid streams one containing a polyisocyanate and the other containing isocyanate-reactive components, for example polyol and/or polyamines reactants, are mixed and rapidly injected into a mould cavity.
• High production rates of moulded polyurethane, polyurea and related polymeric articles having excellent physical properties can be achieved.
• an isocyanate-reactive composition having a plurality of isocyanate-reactive groups comprising:
• At least one low molecular weight polyol including water, immiscible in said high molecular weight compound and having a molecular weight in the range of 18-500;
• the invention also provides for a blend of polyols having improved stability against phase separation comprising a compatibilising amount of a compound of Formula (1).
• the present invention is also concerned with a reaction system for use in making a polymeric article, said system comprising a polyisocyanate composition and the above isocyanate-reactive composition according to the present invention.
• Any two of the groups R 1 and R 4 can be joined together to form at least one non-aromatic ring, preferably a 5, 6 or 7 membered ring.
• alkyl radicals those having 1 to 6 carbon atoms are preferred.
• aralkyl and aryl radicals benzyl, phenyl and phenylethyl are preferred.
• radicals the aliphatic radicals are preferred.
• each of R 1 to R 4 when not H, may be further substituted with a additional amidine residue or group obtained by the removal of any one of R 1 to R 4 radicals from above formula (1) compound.
• Preferred amidine compounds for use in the compositions of the invention contain from 1 to 4 such group(s).
• amidine compounds have molecular weights not greater than 1500, preferably in the range 60 to 600, for example 100 to 600.
• ком ⁇ онент refers to an additive or reagent used to promote the formation of a stable dispersion, colloidal suspension and/or solution of the polyols used in the isocyanate reactive (resin) component of the mixing activated RIM or foam systems.
• the compatibilising agents of the invention have the advantage of providing improved stability and control over reactivity (i.e. flow, gel time) of the isocyanate reactive ingredients at low concentrations.
• a compatibilising amount used herein means an amount of the amidine compound which is sufficient to provide a substantially stable solution or dispersion of isocyanate-reactive compound or compounds and/or improved stability to separation in a mixture comprising otherwise immiscible isocyanate-reactive ingredients.
• this amount will vary depending on the relative molecular weights, the nature of the isocyanate-reactive compound and their relative proportions as well as on the specific structure of the amidine compounds. In general it refers to the amount needed to reduce the rate of phase separation of normally immiscible polyols which amount of amidine, is generally less than 1% by weight of the polyol blend and preferably 0.05-0.25% by weight.
• amidine compounds used as compatibilisers in the compositions of the invention are preferably capable of reacting with isocyanates, without the liberation of monomeric by-products.
• the general class of five membered ring amidines known as imidazolines can be prepared in a manner similar to that outlined above by the combination of a nitrile containing compound with ethylenediamine or any isomer of propanediamine in the presence of an acid catalyst.
• these materials can be prepared by the combination of ethylendiamine, with carboxylic acids under dehydrating conditions.
• Other methods for the preparation of these materials include the combination of ethylenediamine with thioamides or with an imino ether hydrochloride. These procedures are described in "The Chemistry of Heterocyclic compounds: Imidazole and its Derivatives", Part I, Ed. A Weissberg, author K.
• Examples of especially suitable imidazolines and tetrahydro-pyrimidines for use in the composition of the invention include reaction products of above outlined carboxylic acids with ethylene diamine, 1,2-propylenediamine, 1,2-butylenediamine, N-methylelthylenediamine, N-ethyl-ethylenediamine, N-isopropylethylenediamine, 1,3-propylenediamine, 1,3-butanediamine, N-methyl-1,2-propylenediamine, N-methyl-1,3-propylenediamine, N-ethyl-1,3-propylene diamine.
• Typical amidine compounds of cyclic form are: bis-imidazolines derived from adiponitrile or adipic acid of following formula (2) ##STR4## where Y is NH, N-R, or N-Ar; R is a monovalent aliphatic organic group of 1 to 10 carbons and
• Ar is an aromatic organic group of 6 to 18 carbons.
• Mixtures of amidine compounds may be present in the composition, if desired.
• Blends of low molecular weight (LMW) polyols (18-500) including water with high molecular weight (HMW) (2000-12,000) are compatibilized at weight ratios (HMW/LMW) of 10:1-1:1 using 0.05-0.25% by weight of compounds of Formula (1) based on the total weight of the blend.
• LMW low molecular weight
• the polyol blend or isocyanate-reactive composition may be prepared by combining all the ingredients in a single operation (stirring and heating as necessary to provide complete compatibilisation) or, if desired, by pre-blends or concentrates of the formula (1) or (2) compounds and add an effective amount to the isocyanate-reactive ingredients to produce a compatible mix.
• Polyols having molecular weights in the range from 2000 to 12,000 are well known as polyurethane components and may be prepared by methods fully described in the prior art.
• suitable polyols there may be mentioned polythioethers, polyesters, polyesteramides, polycarbonates, polyacetals, polyolefins, polysiloxanes and, especially, polyethers.
• Polyether polyols which may be used include products obtained by the polymerisation of a cyclic oxide, for example ethylene oxide, propylene oxide or tetrahydrofuran in the presence, where necessary, of polyfunctional initiators.
• Suitable initiator compounds contain a plurality of active hydrogen atoms and include water, polyols, for example ethylene glycol, propylene glycol, diethylene glycol, resorcinol, bisphenol A, glycerol, trimethylolpropane, 1,2,6-hexanetriol, triethanolamine, pentaerythritol, sorbitol or sucrose, ammonia, primary monoamines, for example aniline or benzylamine, polyamines, for example ethylene diamine, hexamethylene diamine, toluene diamines, diaminodiphenylmethanes and polymethylene polyphenylene polyamines obtained by the condensation of aniline and formaldehyde, and aminoalcohols, for
• Especially useful polyether polyols include polyoxypropylene and poly(oxyethylene-oxypropylene) diols and triols obtained by the simultaneous or sequential addition of ethylene and propylene oxides to appropriate di- or trifunctional initiators as fully described in the prior art. Mixtures of the said diols and triols are often particularly useful.
• ethylene oxide tipped polyols are often preferred.
• Polyester polyols which may be used include hydroxyl terminated reaction products of polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, 1,4-butanediol, polyether polyols, bis(hydroxyethyl) terephthalate, glycerol, trimethylolpropane or pentaerythritol or mixtures thereof with polycarboxylic acids, especially dicarboxylic acids or their ester-forming derivatives, for example succinic, glutaric and adipic acids or their dimethyl esters, sebacic acid, phthalic anhydride, tetrachlorophthalic anhydride or dimethyl terephthalate. Polyesters obtained by the polymerisation of lactones, for example caprolactone, in conjunction with a polyol, may also be used. Polyesteramides may be obtained by the inclusion of aminoalcohols such as ethanolamine in polyesterfication mixtures.
• polyhydric alcohols such as ethylene glycol,
• Polythioether polyols which may be used include products obtained by condensing thiodiglycol (either alone or with other glycols), with dicarboxylic acids, formaldehyde, alkylene oxides, aminocarboxylic acids, or combinations thereof.
• Polycarbonate polyols which may be used include products obtained by reacting diols such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol or tetraethylene glycol with diaryl carbonates, (for example diphenyl carbonate), with cyclic carbonates (i.e ethylene carbonate), or with phosgene.
• diols such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol or tetraethylene glycol
• diaryl carbonates for example diphenyl carbonate
• cyclic carbonates i.e ethylene carbonate
• phosgene phosgene
• Polyacetal polyols which may be used include those prepared by reacting glycols such as diethylene glycol, triethylene glycol or hexanediol with formaldehyde. Suitable polyacetals may also be prepared by polymerising cyclic acetals. Suitable polyolefin polyols include hydroxy-terminated homo- and copolymers and suitable polysiloxane polyols include polydimethylsiloxane diols and triols, wherein the hydroxyl groups are organically bound.
• the isocyanate-reactive composition according to the present invention may be used for preparing moulded products especially by the reaction injection moulding process and for preparing foams by reaction of this composition with a polyisocyanate together with the usual ingredients for making such moulded products and foams.
• the isocyanate-reactive composition may comprise other high and low molecular weight isocyanate-reactive compounds like polyamines, imino-functional compounds, enamine containing compounds and mixtures thereof. Such compounds have been disclosed for these purposes before. Amongst the high molecular weight polyamines polyether polyamines are most preferred. High molecular weight imino-functional and enamine containing compounds have been described in U.S. Pat. No. 4,794,129 and European Patent Application 361703 respectively.
• the high molecular weight isocyanate-reactive compounds have a molecular weight of 2000 to 8000 and an isocyanate-reactive functionality of 2 to 4 and preferably of 2 to 3.
• Further chain extenders the name used in the art for low molecular weight isocyanate-reactive compounds, may be selected from polyamines like 3,5-diethyl-2,4-toluene diamine, 3,5-diethyl-2,6-toluene diamine, 4,4' and 2,4'-diamino diphenylmethanes, ethylene diamine and polyether diamines, and from imino-functional compounds such as those described in U.S. Pat. No. 4,794,129 and enamines.
• Polyisocyanate compositions which may be reacted with the isocyanate-reactive compositions of the invention in the moulding process may include any of the aliphatic, cycloaliphatic, araliphatic or aromatic polyisocyanates known in polyurethane or polyurea chemistry, especially those that are liquid at room temperature.
• polyisocyanates examples include 1,6-hexamethylene diisocyanate, isophorone diisocyanate, cyclohexane-1,4-diisocyanate, 4,4'-dicyclo-hexylmethane diisocyanate, 1,4-xylylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanates (crude MDI) and 1,5-naphthylene diisocyanate.
• polyisocyanates can be used and also polyisocyanates which have been modified by the introduction of urethane, allophanate, urea, biuret, carbodiimide, uretonimine or isocyanurate residues.
• the aromatic polyisocyanates are preferred, especially the available MDI isomers, that is to say 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate and mixtures thereof.
• MDI variants such as uretonimine-modified MDI and MDI prepolymers are also of great value in the moulding process.
• the reaction systems of the invention may also contain other conventional ingredients of such systems, said ingredients usually being present in the isocyanate-reactive compositions of the invention.
• ingredients include catalysts, for example tin compounds and tertiary amines; surface-active agents and foam stabilisers, for example siloxane-oxyalkylene copolymers, blowing agents, for example water and low boiling halogenated hydrocarbons, internal mold release agents, flame retardants, plasticisers, dyes, fillers and reinforcing agents.
• RIM processes which may be used include structural (including mat-reinforded) RIM, amine extended RIM processes and "spray" RIM processes. Foams may be poured-in-place; free rise; slabstock; molded; or sprayed.
• This example demonstrates improvements in the stability of blends of immiscible polyols achieved through the use of an amidine additive.
• EO ethylene oxide
• DBU diazabicycloundecene

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Polyurethanes Or Polyureas (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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Citations (7)

• 1990
  • 1990-08-16 GB GB909018046A patent/GB9018046D0/en active Pending
• 1991
  • 1991-07-31 DE DE69115165T patent/DE69115165T2/de not_active Expired - Fee Related
  • 1991-07-31 EP EP91307020A patent/EP0471474B1/de not_active Expired - Lifetime
  • 1991-07-31 ES ES91307020T patent/ES2079581T3/es not_active Expired - Lifetime
  • 1991-07-31 AT AT91307020T patent/ATE131182T1/de not_active IP Right Cessation
  • 1991-08-15 JP JP3205150A patent/JPH04233932A/ja active Pending
  • 1991-08-15 US US07/745,340 patent/US5187205A/en not_active Expired - Fee Related
• 1996
  • 1996-10-24 HK HK195596A patent/HK195596A/xx not_active IP Right Cessation

Patent Citations (7)

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